package/ifupdown-scripts: add openrc support

The "network" script allows configuring an interface by means of two
/etc/ifup.<if_name> and /etc/ifdown.<if_name> files with the commands
required to bring it up and down, respectively. So we can support the
BR2_SYSTEM_DHCP config if netifrc is not selected.

- Replace the dependency on !BR2_PACKAGE_OPENRC in Config.in by a
  dependency on !BR2_PACKAGE_NETIFRC.

- Add an IFUPDOWN_SCRIPTS_DHCP_OPENRC macro to create the ifup.<if_name>
  and ifdown.<if_name> files.

- Add an IFUPDOWN_SCRIPTS_INSTALL_INIT_OPENRC hook that includes the
  IFUPDOWN_SCRIPTS_{PREAMBLE,DHCP,DHCP_OPENRC} macros. LOCALHOST is not
  required, since "lo" is configured by the "loopback" script.

Signed-off-by: Carlos Santos <unixmania@gmail.com>
[yann.morin.1998@free.fr:
  - adapt after the preamble was spit to itw own patch
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/ifupdown-scripts/Config.in

@@ -1,7 +1,7 @@
 config BR2_PACKAGE_IFUPDOWN_SCRIPTS
 	bool "ifupdown scripts"
 	default y if BR2_ROOTFS_SKELETON_DEFAULT
-	depends on !BR2_PACKAGE_SYSTEMD_NETWORKD && !BR2_PACKAGE_OPENRC
+	depends on !BR2_PACKAGE_SYSTEMD_NETWORKD && !BR2_PACKAGE_NETIFRC
 	help
 	  Set of scripts used by ifupdown (either the standalone one,
 	  or the busybox one) to bring network up, or tear it down.

package/ifupdown-scripts/ifupdown-scripts.mk

@@ -30,6 +30,12 @@ define IFUPDOWN_SCRIPTS_DHCP
 		echo "  hostname \$$(hostname)"; \
 	) >> $(TARGET_DIR)/etc/network/interfaces
 endef
+define IFUPDOWN_SCRIPTS_DHCP_OPENRC
+	echo "ifup $(IFUPDOWN_SCRIPTS_DHCP_IFACE)" \
+		> $(TARGET_DIR)/etc/ifup.$(IFUPDOWN_SCRIPTS_DHCP_IFACE)
+	echo "ifdown $(IFUPDOWN_SCRIPTS_DHCP_IFACE)" \
+		> $(TARGET_DIR)/etc/ifdown.$(IFUPDOWN_SCRIPTS_DHCP_IFACE)
+endef
 endif
 
 define IFUPDOWN_SCRIPTS_INSTALL_TARGET_CMDS
@@ -38,6 +44,12 @@ define IFUPDOWN_SCRIPTS_INSTALL_TARGET_CMDS
 	$(call SYSTEM_RSYNC,$(IFUPDOWN_SCRIPTS_PKGDIR)/network,$(TARGET_DIR)/etc/network)
 endef
 
+define IFUPDOWN_SCRIPTS_INSTALL_INIT_OPENRC
+	$(IFUPDOWN_SCRIPTS_PREAMBLE)
+	$(IFUPDOWN_SCRIPTS_DHCP)
+	$(IFUPDOWN_SCRIPTS_DHCP_OPENRC)
+endef
+
 define IFUPDOWN_SCRIPTS_INSTALL_INIT_SYSV
 	$(INSTALL) -D -m 0755 $(IFUPDOWN_SCRIPTS_PKGDIR)/S40network \
 		$(TARGET_DIR)/etc/init.d/S40network